EP1017938B1 - Internal combustion engine fuel injection valve - Google Patents

Internal combustion engine fuel injection valve Download PDF

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Publication number
EP1017938B1
EP1017938B1 EP98966195A EP98966195A EP1017938B1 EP 1017938 B1 EP1017938 B1 EP 1017938B1 EP 98966195 A EP98966195 A EP 98966195A EP 98966195 A EP98966195 A EP 98966195A EP 1017938 B1 EP1017938 B1 EP 1017938B1
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EP
European Patent Office
Prior art keywords
holding body
injection valve
fuel injection
fuel
peripheral wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP98966195A
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German (de)
French (fr)
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EP1017938A1 (en
Inventor
Walter Kulovits
Juergen Gottschling
Werner Teschner
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1017938A1 publication Critical patent/EP1017938A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004Joints; Sealings
    • F02M55/005Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14

Definitions

  • the invention relates to a fuel injection valve for Internal combustion engines according to the preamble of claim 1 out.
  • a fuel injection valve for Internal combustion engines according to the preamble of claim 1 out.
  • DE-Gbm.92 06 268.7 known fuel injector is at one in the Housing of the internal combustion engine to be supplied Holding body by means of a valve body of the injection valve axially fixed by a clamping nut.
  • the valve body faces at least one into the combustion chamber at its free end of the internal combustion engine protruding injection opening on one running in the valve body and in the holding body Adjacent fuel inlet channel and by means of a movable Valve member within the valve body with this is connectable.
  • the fuel inlet channel is in the holding body thereby by one to the lower one, facing the valve body End face of the holding body opening axial longitudinal bore and a radial cross hole intersecting this, the inlet opening of the transverse bore on the radial Circumferential wall surface of the holding body a lateral Pressure connection for one from a high pressure fuel pump Laxative fuel supply line forms.
  • Laxative fuel supply line lies on the one formed at the inlet opening of the transverse bore side pressure connection to a pressure port on the external fuel supply line with the holding body combines.
  • This pressure port is in tension screws Axial direction and radially to the axis of the holding body against this clamped, the holding body these clamping forces must completely absorb.
  • the known fuel injection valve has the disadvantage that very high static stresses occur in the area of the intersection of the holes between the vertical longitudinal bore and the horizontal transverse bore of the fuel channel within the holding body due to the clamping forces of the pressure port to be absorbed. With these static loads, it is of great importance whether they cause compressive or tensile stresses in the holding body, with the known fuel injection valve the force introduction axis only forming a line on the circumferential wall and thus producing very large tensile stresses in the area of the intersection of the bores, which thus the permissible pressure threshold in reduce this area.
  • the high static stresses which occur in particular as tangential tensile stresses in the area of the intersection of the bores, lead to long-term breaks in the area of the bore intersection at very high operating loads on the fuel injection valve, in particular at high fuel pressures of over 1800 bar, and thus to a failure of the fuel injection valves in question, so that these are not suitable for use on injection systems working with very high fuel injection pressures.
  • the risk of component failure on the holding body is further exacerbated by vibrational stress, for example by a pulsating internal pressure in the fuel channel in cooperation with the high internal fuel pressure within the fuel channel and the static preload in the holding body.
  • the fuel injector according to the invention for Internal combustion engines with the characteristic features of the Claim 1 has the advantage that a Line pressure as in the known holding body avoided can be and compared to the intersection of the holes Fuel inlet channel in the holding body two line contacts on the opposite side of the pressure port radial peripheral wall surface of the holding body laterally offset to intersect the holes. there this is advantageously done by providing a Deformation of the peripheral surface of the holding body on its lateral pressure connection opposite radial Peripheral wall portion. This way, within the Deformation and stress range in the amount of Hole intersection to widen the hole counteracting voltage torque generated. This Stress torque is derived from the resulting Forces formed on the holding body, the clamping force of the Counteract the pressure port on the side pressure connection.
  • the side pressure connection on the holding body opposite indentation is preferably as Material removal from the radial peripheral wall of the holding body trained, but it is alternatively also possible to be included in the original shaping of the holding body.
  • the removal of material from the indentation on the holding body is involved preferably designed as a bevel, the between the surface grinding and the rest of the radial Circumferential wall region of the holding body formed Transition edges outside the force transmission axis on lateral pressure connection.
  • the lateral pressure connection on the holding body can as in Embodiment shown, perpendicular to the axis of the Holding body may be arranged, however, is also alternative an inclined arrangement possible. Furthermore, in Embodiment shown a surface grinding and described, the indentations on the circumference of the holding body can alternatively also other forms, for example have spherical or curved surfaces.
  • Fuel injection valve for internal combustion engines is in of the drawing and is shown in the following Description approaching explained.
  • FIG. 1 shows a longitudinal section through a Holding body of the fuel injector according to the invention and FIG. 2 shows a cross section of the holding body of the figure 1 along lines II.
  • Fuel injection valve is essential to the invention Representation of a holding body 1 of the Fuel injector limited.
  • This holding body 1 has a cylindrical basic shape, on the upper axial end face 3 in a manner not shown Tension screw or claw that attacks the holding body 1 with its lower end face 5 axially against one shown valve body clamped.
  • Fuel inlet channel 7 is provided, which consists of one of the lower end face 5 outgoing axial longitudinal bore 9 and one of these intersecting radial transverse bore 11 is formed is.
  • the inlet opening forms the radial one Cross bore 11 on the radial peripheral wall surface of the Holding body 1 has a lateral pressure connection 13.
  • This lateral pressure connection 13 has an outward directional conical cross-sectional expansion of the radial Cross bore 11 into which a pressure connection sleeve 15th is used, whose conical inside diameter as Recording area for a pressure port one Fuel supply line is used by a non High-pressure fuel pump shown starting at the lateral pressure connection 13 of the holding body 1 opens and it is supplied with high pressure fuel.
  • a valve spring of the Fuel injector is used and one Leakage hole 19 leads away.
  • the counterforce F counteracting the clamping force 23 is now divided into two force components running at right angles to one another, of which a force component F y runs perpendicular to the force introduction axis 23 and a force component F x in the direction of the force introduction axis 23 and its clamping force.
  • a resulting force component F res arises at the transition edges 25. a, which points in the direction of the longitudinal bore 9 in the holding body 1 and thus generates an advantageous compressive stress component in the holding body 1, which counteracts a possible widening of the longitudinal bore 9 or transverse bore 11 due to the high internal fuel pressure.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

Stand der TechnikState of the art

Die Erfindung geht von einem Kraftstoffeinspritzventil für Brennkraftmaschinen nach der Gattung des Patentanspruchs 1 aus. Bei einem derartigen, aus dem DE-Gbm.92 06 268.7 bekannten Kraftstoffeinspritzventil ist an einem in das Gehäuse der zu versorgenden Brennkraftmaschine eingesetzten Haltekörper ein Ventilkörper des Einspritzventils mittels einer Spannmutter axial befestigt. Der Ventilkörper weist dabei an seinem freien Ende wenigstens eine in den Brennraum der Brennkraftmaschine ragende Einspritzöffnung auf, die an einen im Ventilkörper und im Haltekörper verlaufenden Kraftstoffzulaufkanal angrenzt und mittels eines beweglichen Ventilgliedes innerhalb des Ventilkörpers mit diesem verbindbar ist. Der Kraftstoffzulaufkanal im Haltekörper ist dabei durch eine an die untere, dem Ventilkörper zugewandte Stirnfläche des Haltekörpers mündende axiale Längsbohrung und eine, diese schneidende radiale Querbohrung gebildet, wobei die Eintrittsöffnung der Querbohrung an der radialen Umfangswandfläche des Haltekörpers einen seitlichen Druckanschluß für eine von einer Kraftstoffhochdruckpumpe abführende Kraftstoffzuführungsleitung bildet. Dabei liegt an dem an der Eintrittsöffnung der Querbohrung gebildeten seitlichen Druckanschluß ein Druckstutzen an, der die externe Kraftstoffzuführungsleitung mit dem Haltekörper verbindet. Dieser Druckstutzen wird über Spannschrauben in Achsrichtung und radial zur Achse des Haltekörpers gegen diesen verspannt, wobei der Haltekörper diese Einspannkräfte vollständig aufnehmen muß.The invention relates to a fuel injection valve for Internal combustion engines according to the preamble of claim 1 out. In such a, from DE-Gbm.92 06 268.7 known fuel injector is at one in the Housing of the internal combustion engine to be supplied Holding body by means of a valve body of the injection valve axially fixed by a clamping nut. The valve body faces at least one into the combustion chamber at its free end of the internal combustion engine protruding injection opening on one running in the valve body and in the holding body Adjacent fuel inlet channel and by means of a movable Valve member within the valve body with this is connectable. The fuel inlet channel is in the holding body thereby by one to the lower one, facing the valve body End face of the holding body opening axial longitudinal bore and a radial cross hole intersecting this, the inlet opening of the transverse bore on the radial Circumferential wall surface of the holding body a lateral Pressure connection for one from a high pressure fuel pump Laxative fuel supply line forms. Here lies on the one formed at the inlet opening of the transverse bore side pressure connection to a pressure port on the external fuel supply line with the holding body combines. This pressure port is in tension screws Axial direction and radially to the axis of the holding body against this clamped, the holding body these clamping forces must completely absorb.

Dabei weist das bekannte Kraftstoffeinspritzventil den Nachteil auf, daß aufgrund der aufzunehmenden Einspannkräfte des Druckstutzens am seitlichen Druckanschluß sehr hohe statische Spannungen im Bereich der Bohrungsverschneidung zwischen der senkrechten Längsbohrung und der waagerechten Querbohrung des Kraftstoffkanals innerhalb des Haltekörpers auftreten. Bei diesen statischen Belastungen ist es von großer Bedeutung ob sie Druck- oder Zugspannungen im Haltekörper verursachen, wobei bei dem bekannten Kraftstoffeinspritzventil die Krafteinleitungsachse nur eine Linie an der Umfangswand bildet und so sehr große Zugspannungen im Bereich der Bohrungsverschneidung erzeugt, die so den zulässigen Druckschwellwert in diesem Bereich verringern.
Die hohen statischen Spannungen, die insbesondere als tangentiale Zugverspannungen im Bereich der genannten Bohrungsverschneidung auftreten, führen dabei bei sehr hohen Betriebsbelastungen des Kraftstoffeinspritzventils, insbesondere bei Kraftstoffhochdrücken von über 1800bar zu Dauerbrüchen im Bereich der Bohrungsverschneidung und somit zu einem Ausfall der betreffenden Kraftstoffeinspritzventile, so daß diese für einen Einsatz an mit sehr hohen Kraftstoffeinspritzdrücken arbeitenden Einspritzsystemen nicht geeignet sind.
Dabei wird die Gefahr eines Bauteilversagens am Haltekörper durch eine Schwingbeanspruchung, z.B. durch einen pulsierenden Innendruck im Kraftstoffkanal im Zusammenwirken mit dem hohen Kraftstoffinnendruck innerhalb des Kraftstoffkanals und der statischen Vorspannung im Haltekörper weiter verstärkt.
The known fuel injection valve has the disadvantage that very high static stresses occur in the area of the intersection of the holes between the vertical longitudinal bore and the horizontal transverse bore of the fuel channel within the holding body due to the clamping forces of the pressure port to be absorbed. With these static loads, it is of great importance whether they cause compressive or tensile stresses in the holding body, with the known fuel injection valve the force introduction axis only forming a line on the circumferential wall and thus producing very large tensile stresses in the area of the intersection of the bores, which thus the permissible pressure threshold in reduce this area.
The high static stresses, which occur in particular as tangential tensile stresses in the area of the intersection of the bores, lead to long-term breaks in the area of the bore intersection at very high operating loads on the fuel injection valve, in particular at high fuel pressures of over 1800 bar, and thus to a failure of the fuel injection valves in question, so that these are not suitable for use on injection systems working with very high fuel injection pressures.
The risk of component failure on the holding body is further exacerbated by vibrational stress, for example by a pulsating internal pressure in the fuel channel in cooperation with the high internal fuel pressure within the fuel channel and the static preload in the holding body.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße Kraftstoffeinspritzventil für Brennkraftmaschinen mit den kennzeichnenden Merkmalen des Patentanspruchs 1 hat demgegenüber den Vorteil, daß eine Linienpressung wie beim bekannten Haltekörper vermieden werden kann und gegenüber der Bohrungsverschneidung des Kraftstoffzulaufkanals im Haltekörper zwei Linienberührungen an der dem seitlichen Druckstutzen gegenüberliegenden radialen Umfangswandfläche des Haltekörpers seitlich versetzt zur Bohrungsverschneidung gebildet werden. Dabei erfolgt dies in vorteilhafter Weise durch das Vorsehen einer Einformung der Umfangsfläche des Haltekörpers an seinem dem seitlichen Druckanschluß gegenüberliegenden radialen Umfangswandbereich. Auf diese Weise wird innerhalb des Verformungs- und Spannungsbereiches in Höhe der Bohrungsverschneidung ein dem Aufweiten der Bohrung entgegenwirkendes Spannungsdrehmoment erzeugt. Dieses Spannungsdrehmoment wird dabei aus den resultierenden Kräften am Haltekörper gebildet, die der Einspannkraft des Druckstutzens am seitlichen Druckanschluß entgegenwirken. Dabei entsteht nunmehr zusätzlich zu dem der axialen Einspannkraft auf einer Achse entgegenwirkenden Gegenkraft eine rechtwinklig zu dieser verlaufende Kraftkomponente, so daß die beschriebenen, der Aufweitung der Kraftstoffzulaufkanalbohrung entgegenwirkenden Spannungsmomente erzeugt werden. Auf diese Weise lassen sich geringere Verformungen und somit geringere Zugspannung innerhalb des Ventilkörpers erreichen, so daß das Verspannen des Druckstutzens am seitlichen Druckanschluß die Eigenspannungen, insbesondere die Zugspannungen des Haltekörpers nicht mehr in unzulässiger Weise erhöhen. Dabei führt diese Verringerung der Eigenspannungen im Haltekörper zu einer höheren Festigkeit und somit einer höheren Lebensdauer des Haltekörpers des erfindungsgemäßen Kraftstoffeinspritzventils auch bei Betriebsdrücken von bis zu 2000 bar und wechselnder Schwingbeanspruchung.The fuel injector according to the invention for Internal combustion engines with the characteristic features of the Claim 1 has the advantage that a Line pressure as in the known holding body avoided can be and compared to the intersection of the holes Fuel inlet channel in the holding body two line contacts on the opposite side of the pressure port radial peripheral wall surface of the holding body laterally offset to intersect the holes. there this is advantageously done by providing a Deformation of the peripheral surface of the holding body on its lateral pressure connection opposite radial Peripheral wall portion. This way, within the Deformation and stress range in the amount of Hole intersection to widen the hole counteracting voltage torque generated. This Stress torque is derived from the resulting Forces formed on the holding body, the clamping force of the Counteract the pressure port on the side pressure connection. This now creates in addition to that of the axial Clamping force on a counteracting counterforce a perpendicular to this component of force, so that the described, the expansion of Counteracting fuel inlet channel bore Torque moments are generated. This way less deformation and therefore less tension reach inside the valve body so that the bracing of the pressure port on the side pressure connection Residual stresses, especially the tensile stresses of the Do not increase the holding body in an impermissible manner. there leads to this reduction in the internal stresses in the holding body to a higher strength and thus a higher Life of the holding body of the invention Fuel injection valve even at operating pressures of up to up to 2000 bar and changing vibration stress.

Die dem seitlichen Druckanschluß am Haltekörper gegenüberliegende Einformung ist dabei vorzugsweise als Materialabtrag von der radialen Umfangswand des Haltekörpers ausgebildet, es ist jedoch alternativ auch möglich diese bereits beim Urformen des Haltekörpers mit einzuarbeiten. Der Materialabtrag der Einformung am Haltekörper ist dabei vorzugsweise als Flächenanschliff ausgebildet, wobei die zwischen dem Flächenanschliff und dem übrigen radialen Umfangswandbereich des Haltekörpers gebildeten Übergangskanten außerhalb der Krafteinleitungsachse am seitlichen Druckanschluß liegen. Bei dieser Verlagerung der Anlagelinie an der radialen Umfangswand auf zwei seitlich Anlagelinien wird das Material des Haltekörpers durch das beschriebene Spannungsmoment nach innen verdrängt und es entstehen geringere Zugspannungen bzw. es entstehen nunmehr Druckspannungen im Bereich der Bohrungsverschneidung, die deren Aufweitung entgegenwirken. Dies wirkt sich besonders bei hochfesten Werkstoffen mit einer hohen Mittelspannungsempfindlichkeit (zum Beispiel 42CRMO4PB) zum Vorteil aus.The side pressure connection on the holding body opposite indentation is preferably as Material removal from the radial peripheral wall of the holding body trained, but it is alternatively also possible to be included in the original shaping of the holding body. The removal of material from the indentation on the holding body is involved preferably designed as a bevel, the between the surface grinding and the rest of the radial Circumferential wall region of the holding body formed Transition edges outside the force transmission axis on lateral pressure connection. With this shift the Line on the radial peripheral wall on two sides The lines of the material of the holding body through the described stress moment displaced inwards and it lower tensile stresses arise or it now arises Compressive stresses in the area of the intersection of the bores counteract their expansion. This affects particularly for high-strength materials with a high Medium voltage sensitivity (for example 42CRMO4PB) for Advantage off.

Der seitliche Druckanschluß am Haltekörper kann dabei wie im Ausführungsbeispiel gezeigt, rechtwinklig zur Achse des Haltekörpers angeordnet sein, alternativ ist jedoch auch eine geneigte Anordnung möglich. Desweiteren ist im Ausführungsbeispiel ein Flächenanschliff gezeigt und beschrieben, die Einformungen am Umfang des Haltekörpers können alternativ jedoch auch andere Formen, zum Beispiel ballige oder gewölbte Flächen aufweisen. The lateral pressure connection on the holding body can as in Embodiment shown, perpendicular to the axis of the Holding body may be arranged, however, is also alternative an inclined arrangement possible. Furthermore, in Embodiment shown a surface grinding and described, the indentations on the circumference of the holding body can alternatively also other forms, for example have spherical or curved surfaces.

Es ist somit mit dem erfindungsgemäßen Kraftstoffeinspritzventil möglich, die Festigkeit des Haltekörpers gegenüber Schwingbeanspruchungen und statischen Belastungen erheblich zu erhöhen, ohne dabei den ursprünglichen Bauraum des Kraftstoffeinspritzventils zu vergrößern.It is thus with the invention Fuel injector possible, the strength of the Holding body against vibration and static To significantly increase loads without reducing the original space of the fuel injector enlarge.

Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung sind der Zeichnung, der Beschreibung und den Patentansprüchen entnehmbar.Further advantages and advantageous configurations of the The invention relates to the drawing, the Description and the patent claims.

Zeichnungdrawing

Ein Ausführungsbeispiel des erfindungsgemäßen Kraftstoffeinspritzventils für Brennkraftmaschinen ist in der Zeichnung dargestellt und wird in der nachfolgenden Beschreibung nähert erläutert.An embodiment of the invention Fuel injection valve for internal combustion engines is in of the drawing and is shown in the following Description approaching explained.

Es zeigen die Figur 1 einen Längsschnitt durch einen Haltekörper des erfindungsgemäßen Kraftstoffeinspritzventils und die Figur 2 einen Querschnitt des Haltekörpers der Figur 1 entlang der Linien II.1 shows a longitudinal section through a Holding body of the fuel injector according to the invention and FIG. 2 shows a cross section of the holding body of the figure 1 along lines II.

Beschreibung des AusführungsbeispielsDescription of the embodiment

Die Darstellung des in den Figuren 1 und in einem Ausschnitt aus dieser in der Figur 2 dargestellten erfindungsgemäßen Kraftstoffeinspriztventils ist auf die erfindungswesentliche Darstellung eines Haltekörpers 1 des Kraftstoffeinspritzventils beschränkt. Dieser Haltekörper 1 weist eine zylindrische Grundform auf, an dessen oberer axialer Stirnfläche 3 in nicht näher gezeigter Weise eine Spannschraube oder Pratze angreift, die den Haltekörper 1 mit seiner unteren Stirnfläche 5 axial gegen einen nicht gezeigten Ventilkörper verspannt. Zur Kraftstoffzuführung an den nicht gezeigten Ventilkörper ist im Haltekörper 1 ein Kraftstoffzulaufkanal 7 vorgesehen, der aus einer von der unteren Stirnfläche 5 ausgehenden axialen Längsbohrung 9 und einer diese schneidenden radialen Querbohrung 11 gebildet ist. Dabei bildet die Eintrittsöffnung der radialen Querbohrung 11 an der radialen Umfangswandfläche des Haltekörpers 1 einen seitlichen Druckanschluß 13. Dieser seitliche Druckanschluß 13 weist dabei eine nach außen gerichtete konische Querschnittserweiterung der radialen Querbohrung 11 auf, in die eine Druckanschlußhülse 15 eingesetzt ist, deren konischer Innendurchmesser als Aufnahmefläche für einen Druckstutzen einer Kraftstoffzuführungsleitung dient, die von einer nicht dargestellten Kraftstoffhochdruckpumpe ausgehend an den seitlichen Druckanschluß 13 des Haltekörpers 1 mündet und diesen so mit Kraftstoff hohen Druckes versorgt.The representation of the in Figures 1 and in a section from this according to the invention shown in Figure 2 Fuel injection valve is essential to the invention Representation of a holding body 1 of the Fuel injector limited. This holding body 1 has a cylindrical basic shape, on the upper axial end face 3 in a manner not shown Tension screw or claw that attacks the holding body 1 with its lower end face 5 axially against one shown valve body clamped. To supply fuel the valve body, not shown, is in the holding body 1 Fuel inlet channel 7 is provided, which consists of one of the lower end face 5 outgoing axial longitudinal bore 9 and one of these intersecting radial transverse bore 11 is formed is. The inlet opening forms the radial one Cross bore 11 on the radial peripheral wall surface of the Holding body 1 has a lateral pressure connection 13. This lateral pressure connection 13 has an outward directional conical cross-sectional expansion of the radial Cross bore 11 into which a pressure connection sleeve 15th is used, whose conical inside diameter as Recording area for a pressure port one Fuel supply line is used by a non High-pressure fuel pump shown starting at the lateral pressure connection 13 of the holding body 1 opens and it is supplied with high pressure fuel.

Desweiteren ist von der unteren Stirnfläche 5 des Haltekörpers 1 ausgehend eine zentrale Sackbohrung 17 in den Haltekörper 1 eingebracht, die zur Aufnahme eines Rückstellgliedes, vorzugsweise einer Ventilfeder des Kraftstoffeinspritzventiles dient und von der eine Leckagebohrung 19 abführt.Furthermore, from the lower end face 5 of the Holding body 1 starting from a central blind bore 17 in the Retained body 1 introduced to accommodate a Reset member, preferably a valve spring of the Fuel injector is used and one Leakage hole 19 leads away.

Zur Verbesserung der Eigenspannungen des Haltekörpers bei der Kraftaufnahme durch das radial zur Haltekörperachse gerichtete Verspannen des Hochdruckleitungsanschlußes am seitlichen Druckanschluß 13 ist die radiale Umfangsfläche des Haltekörpers im dem seitlichen Druckanschluß 13 gegenüberliegenden Wandbereich abgeflacht ausgeführt. Diese in der Figur 2 näher dargestellte Abflachung 21 ist dabei als Flächenanschliff ausgebildet, der im Ausführungsbeispiel rechtwinklig zu einer Krafteinleitungsachse 23 ausgerichtet ist, die den Einspann-Kraftfluß des Hochdruckanschlußes am seitlichen Druckanschluß 13 und dessen Einleitung in den Haltekörper 1 charakterisiert. Dabei entstehen durch den Flächenanschliff 21 an der radialen Umfangswand des Haltekörpers 1 Übergangskanten 25 zur übrigen radialen Umfangswand des Haltekörpers 1, die außerhalb der Krafteinleitungsachse 23 des seitlichen Druckanschlußes 13 verlaufen.To improve the internal stresses of the holding body the force absorption through the radial to the holding body axis directed clamping of the high pressure line connection on lateral pressure connection 13 is the radial peripheral surface of the holding body in the lateral pressure connection 13th opposite wall area flattened. This is shown in Figure 2 flattening 21 formed as surface grinding, which in the embodiment aligned perpendicular to a force introduction axis 23 is that the clamping force flow of the high pressure connection on lateral pressure connection 13 and its introduction into the Holding body 1 characterized. Thereby arise from the Surface grinding 21 on the radial peripheral wall of the Holding body 1 transition edges 25 to the rest of the radial Circumferential wall of the holding body 1, which is outside the Force introduction axis 23 of the lateral pressure connection 13 run.

Dabei wird durch diese Verlagerung der Einspannpreß-Linien auf zwei seitlich versetzte Linien das Werkstoffmaterial des Haltekörpers 1 an den Übergangskanten 25 mit einem Spannungsmoment nach innen verdrängt, so daß die Zugspannungen innerhalb des Haltekörpers 1 abgebaut werden können. Zudem entstehen auf diese Weise Druckspannungen im Bereich der Bohrungsverschneidung zwischen der Längsbohrung 9 und der Querbohrung 11 des Kraftstoffzulaufkanals 7, durch die Druckschwellfestigkeit gegenüber einem pulsierenden Innendruck innerhalb des Kraftstoffzulaufkanals 7 erheblich erhöht werden kann. Die der Einspannkraft 23 entgegenwirkende Gegenkraft F teilt sich nunmehr in zwei rechtwinklig zueinander verlaufende Kraftkomponenten, von denen eine Kraftkomponente Fy rechtwinklig zur Krafteinleitungsachse 23 und eine Kraftkomponente Fx in Richtung der Krafteinleitungsachse 23 und dessen Einspannkraft entgegenwirkend verlaufen. Dabei stellt sich wie in der Figur 2 dargestellt an den Übergangskanten 25 jeweils eine resultierende Kraftkomponente Fres. ein, die in Richtung Längsbohrung 9 in den Haltekörper 1 hineinweist und somit eine vorteilhafte Druckspannungskomponente im Haltekörper 1 erzeugt, die einem möglichen Aufweiten der Längsbohrung 9 beziehungsweise Querbohrung 11 infolge des hohen Kraftstoffinnendruckes entgegenwirkt.This shifting of the clamping lines to two laterally offset lines displaces the material of the holding body 1 at the transition edges 25 with a tension moment inwards, so that the tensile stresses within the holding body 1 can be reduced. In addition, this results in compressive stresses in the region of the intersection of the holes between the longitudinal bore 9 and the transverse bore 11 of the fuel inlet channel 7, by means of which pressure threshold strength can be increased considerably with respect to a pulsating internal pressure within the fuel inlet channel 7. The counterforce F counteracting the clamping force 23 is now divided into two force components running at right angles to one another, of which a force component F y runs perpendicular to the force introduction axis 23 and a force component F x in the direction of the force introduction axis 23 and its clamping force. Here, as shown in FIG. 2, a resulting force component F res arises at the transition edges 25. a, which points in the direction of the longitudinal bore 9 in the holding body 1 and thus generates an advantageous compressive stress component in the holding body 1, which counteracts a possible widening of the longitudinal bore 9 or transverse bore 11 due to the high internal fuel pressure.

Auf diese Weise läßt sich in konstruktiv einfacher Weise die Dauerfestigkeit auch bei sehr hohen Kraftstoffinnendrücken und hohen Einspannkräften am seitlichen Druckanschluß 13 erhöhen, so daß die Dauerhaltbarkeit des gesamten Kraftstoffeinspritzventils verbessert werden kann, ohne dazu einzelne Bauelemente verstärkt ausbilden zu müssen.In this way, the Fatigue strength even at very high internal fuel pressures and high clamping forces on the lateral pressure connection 13 increase so that the durability of the whole Fuel injector can be improved without doing so to have to train more individual components.

Claims (6)

  1. Fuel injection valve for internal combustion engines, having a holding body (1), which can be fitted into a housing of the internal combustion engine, can be clamped to a valve body projecting into the combustion chamber of the internal combustion engine and in which there is a fuel feed duct (7) leading to an injection opening at the valve body, the fuel feed duct (7) in the holding body (1) being formed by a longitudinal bore (9) and a transverse bore (11) which intersects the longitudinal bore and the inlet opening of which, at a radial peripheral wall of the holding body (1), forms a lateral pressure port (13) for a fuel feed line, the holding body (1), in the region of its radial peripheral wall surface on the opposite side from the lateral pressure port (13), having a radially inwardly directed shaped recess (21) which has transition edges (25) with respect to the remaining radial peripheral wall of the holding body (1), characterized in that the transition edges (25) run outside a force introduction axis (23) of the lateral pressure port (13) and serve as clamping pressure lines for the holding body (1).
  2. Fuel injection valve according to Claim 1, characterized in that the shaped recess (21) is formed by removal of material from the radial peripheral wall of the holding body (1).
  3. Fuel injection valve according to Claim 2, characterized in that the removal of material is performed by surface grinding.
  4. Fuel injection valve according to Claim 1, characterized in that the transverse bore (11) of the fuel feed duct (7) in the holding body (1) runs at right angles to the longitudinal axis of the fuel feed duct (7).
  5. Fuel injection valve according to Claims 1 and 3, characterized in that the surface grinding (21) is at right angles to the force introduction axis (23) of the lateral pressure port (13).
  6. Fuel injection valve according to Claim 1, characterized in that the transition edges (25) between the shaped recess (21) and the remaining radial peripheral wall region of the holding body (1) run axially parallel with respect to the longitudinal axis of the holding body (1).
EP98966195A 1998-04-01 1998-12-07 Internal combustion engine fuel injection valve Expired - Lifetime EP1017938B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19814501A DE19814501A1 (en) 1998-04-01 1998-04-01 Fuel injection valve for internal combustion engines
DE19814501 1998-04-01
PCT/DE1998/003579 WO1999050553A1 (en) 1998-04-01 1998-12-07 Internal combustion engine fuel injection valve

Publications (2)

Publication Number Publication Date
EP1017938A1 EP1017938A1 (en) 2000-07-12
EP1017938B1 true EP1017938B1 (en) 2003-10-15

Family

ID=7863180

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98966195A Expired - Lifetime EP1017938B1 (en) 1998-04-01 1998-12-07 Internal combustion engine fuel injection valve

Country Status (5)

Country Link
US (1) US6382186B1 (en)
EP (1) EP1017938B1 (en)
JP (1) JP2002500727A (en)
DE (2) DE19814501A1 (en)
WO (1) WO1999050553A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7021291B2 (en) * 2003-12-24 2006-04-04 Cummins Inc. Juncture for a high pressure fuel system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845748A (en) * 1972-09-29 1974-11-05 Mack Trucks Fuel injection nozzle holder installation
ES480129A1 (en) * 1978-07-01 1980-01-16 Lucas Industries Ltd Fuel injection nozzle
EP0170845B1 (en) * 1984-08-08 1988-08-31 Georg Fischer Aktiengesellschaft Shaped piercing piece for joining a branch pipe
US4846406A (en) * 1987-12-04 1989-07-11 Wade Manufacturing Co. Micro flow control valve for irrigation systems and method
DE9206268U1 (en) * 1992-05-09 1993-09-09 Robert Bosch Gmbh, 70469 Stuttgart Fuel supply device for an injection nozzle
DE4239173C1 (en) * 1992-11-21 1993-09-02 Mercedes-Benz Aktiengesellschaft, 70327 Stuttgart, De Cylinder-head for fuel-injection engine - has pressure pipe passing through clamping screw and with union at protruding end for injection pipe
GB2322922B (en) * 1997-03-03 2002-03-06 Usui Kokusai Sangyo Kk Common rail and method of manufacturing the same
DE19728111A1 (en) * 1997-07-02 1999-01-07 Bosch Gmbh Robert Fuel injection system

Also Published As

Publication number Publication date
US6382186B1 (en) 2002-05-07
EP1017938A1 (en) 2000-07-12
DE19814501A1 (en) 1999-10-07
JP2002500727A (en) 2002-01-08
DE59809937D1 (en) 2003-11-20
WO1999050553A1 (en) 1999-10-07

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